Laptop won't reboot No bootable device

Hello,
I can't turn on my laptop I've tried pressing f2 and f12 nothing happens I have a black screen with the message "intel UNDI, PXE-2.1 (build 082) copyright (c) 1997-2000 intel corporation

For Realtek RTL8101E/8102E PCI-E Ethernet controller v1.07 (080320)
PXE-E61: media test failure, check cable
PXE-MOF: Exiting PXE ROM
No bootable device -- insert boot disc and press any key